1. American Institute of Ultrasound in Medicine. Guidelines for cleaning and preparing external- and internal-use ultrasound probes between patients, safe handling, and use of ultrasound coupling gel. 2017. Available at: https://www.aium.org/accreditation/Guidelines_Cleaning_Preparing.pdf.
2. Pelvic floor ultrasound: a review;Dietz;Am J Obstet Gynecol,2010
3. Biometry of the pubovisceral muscle and levator hiatus by three-dimensional pelvic floor ultrasound;Dietz;Ultrasound Obstet Gynecol,2005
4. Perineal and anal sphincter trauma,2007
5. Obstetric pelvic floor and anal sphincter injuries;Lone;Obstet Gynaecol,2012